export default {
  md5(string) {
    function md5RotateLeft(lValue, iShiftBits) {
      return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits))
    }

    function md5AddUnsigned(lX, lY) {
      let lX4, lY4, lX8, lY8, lResult
      lX8 = (lX & 0x80000000)
      lY8 = (lY & 0x80000000)
      lX4 = (lX & 0x40000000)
      lY4 = (lY & 0x40000000)
      lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF)
      if (lX4 & lY4) {
        return (lResult ^ 0x80000000 ^ lX8 ^ lY8)
      }
      if (lX4 | lY4) {
        if (lResult & 0x40000000) {
          return (lResult ^ 0xC0000000 ^ lX8 ^ lY8)
        } else {
          return (lResult ^ 0x40000000 ^ lX8 ^ lY8)
        }
      } else {
        return (lResult ^ lX8 ^ lY8)
      }
    }

    function md5F(x, y, z) {
      return (x & y) | ((~x) & z)
    }

    function md5G(x, y, z) {
      return (x & z) | (y & (~z))
    }

    function md5H(x, y, z) {
      return (x ^ y ^ z)
    }

    function md5I(x, y, z) {
      return (y ^ (x | (~z)))
    }

    function md5FF(a, b, c, d, x, s, ac) {
      a = md5AddUnsigned(a, md5AddUnsigned(md5AddUnsigned(md5F(b, c, d), x), ac))
      return md5AddUnsigned(md5RotateLeft(a, s), b)
    }

    function md5GG(a, b, c, d, x, s, ac) {
      a = md5AddUnsigned(a, md5AddUnsigned(md5AddUnsigned(md5G(b, c, d), x), ac))
      return md5AddUnsigned(md5RotateLeft(a, s), b)
    }

    function md5HH(a, b, c, d, x, s, ac) {
      a = md5AddUnsigned(a, md5AddUnsigned(md5AddUnsigned(md5H(b, c, d), x), ac))
      return md5AddUnsigned(md5RotateLeft(a, s), b)
    }

    function md5II(a, b, c, d, x, s, ac) {
      a = md5AddUnsigned(a, md5AddUnsigned(md5AddUnsigned(md5I(b, c, d), x), ac))
      return md5AddUnsigned(md5RotateLeft(a, s), b)
    }

    function md5ConvertToWordArray(string) {
      let lWordCount
      let lMessageLength = string.length
      let lNumberOfWordsTemp1 = lMessageLength + 8
      let lNumberOfWordsTemp2 = (lNumberOfWordsTemp1 - (lNumberOfWordsTemp1 % 64)) / 64
      let lNumberOfWords = (lNumberOfWordsTemp2 + 1) * 16
      let lWordArray = Array(lNumberOfWords - 1)
      let lBytePosition = 0
      let lByteCount = 0
      while (lByteCount < lMessageLength) {
        lWordCount = (lByteCount - (lByteCount % 4)) / 4
        lBytePosition = (lByteCount % 4) * 8
        lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount) << lBytePosition))
        lByteCount++
      }
      lWordCount = (lByteCount - (lByteCount % 4)) / 4
      lBytePosition = (lByteCount % 4) * 8
      lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition)
      lWordArray[lNumberOfWords - 2] = lMessageLength << 3
      lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29
      return lWordArray
    }

    function md5WordToHex(lValue) {
      let WordToHexValue = ''
      let WordToHexValueTemp = ''
      let lByte
      let lCount
      for (lCount = 0; lCount <= 3; lCount++) {
        lByte = (lValue >>> (lCount * 8)) & 255
        WordToHexValueTemp = '0' + lByte.toString(16)
        WordToHexValue = WordToHexValue + WordToHexValueTemp.substr(WordToHexValueTemp.length - 2, 2)
      }
      return WordToHexValue
    }

    function md5Utf8Encode(string) {
      string = string.replace(/\r\n/g, '\n')
      let utftext = ''
      for (let n = 0; n < string.length; n++) {
        let c = string.charCodeAt(n)
        if (c < 128) {
          utftext += String.fromCharCode(c)
        } else if ((c > 127) && (c < 2048)) {
          utftext += String.fromCharCode((c >> 6) | 192)
          utftext += String.fromCharCode((c & 63) | 128)
        } else {
          utftext += String.fromCharCode((c >> 12) | 224)
          utftext += String.fromCharCode(((c >> 6) & 63) | 128)
          utftext += String.fromCharCode((c & 63) | 128)
        }
      }
      return utftext
    }

    let x = []
    let k
    let AA
    let BB
    let CC
    let DD
    let a
    let b
    let c
    let d
    let [S11, S12, S13, S14, S21, S22, S23, S24, S31, S32, S33, S34, S41, S42, S43, S44] =
      [7, 12, 17, 22, 5, 9, 14, 20, 4, 11, 16, 23, 6, 10, 15, 21]
    string = md5Utf8Encode(string)
    x = md5ConvertToWordArray(string)
    a = 0x67452301
    b = 0xEFCDAB89
    c = 0x98BADCFE
    d = 0x10325476
    for (k = 0; k < x.length; k += 16) {
      AA = a
      BB = b
      CC = c
      DD = d
      a = md5FF(a, b, c, d, x[k + 0], S11, 0xD76AA478)
      d = md5FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756)
      c = md5FF(c, d, a, b, x[k + 2], S13, 0x242070DB)
      b = md5FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE)
      a = md5FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF)
      d = md5FF(d, a, b, c, x[k + 5], S12, 0x4787C62A)
      c = md5FF(c, d, a, b, x[k + 6], S13, 0xA8304613)
      b = md5FF(b, c, d, a, x[k + 7], S14, 0xFD469501)
      a = md5FF(a, b, c, d, x[k + 8], S11, 0x698098D8)
      d = md5FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF)
      c = md5FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1)
      b = md5FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE)
      a = md5FF(a, b, c, d, x[k + 12], S11, 0x6B901122)
      d = md5FF(d, a, b, c, x[k + 13], S12, 0xFD987193)
      c = md5FF(c, d, a, b, x[k + 14], S13, 0xA679438E)
      b = md5FF(b, c, d, a, x[k + 15], S14, 0x49B40821)
      a = md5GG(a, b, c, d, x[k + 1], S21, 0xF61E2562)
      d = md5GG(d, a, b, c, x[k + 6], S22, 0xC040B340)
      c = md5GG(c, d, a, b, x[k + 11], S23, 0x265E5A51)
      b = md5GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA)
      a = md5GG(a, b, c, d, x[k + 5], S21, 0xD62F105D)
      d = md5GG(d, a, b, c, x[k + 10], S22, 0x2441453)
      c = md5GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681)
      b = md5GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8)
      a = md5GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6)
      d = md5GG(d, a, b, c, x[k + 14], S22, 0xC33707D6)
      c = md5GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87)
      b = md5GG(b, c, d, a, x[k + 8], S24, 0x455A14ED)
      a = md5GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905)
      d = md5GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8)
      c = md5GG(c, d, a, b, x[k + 7], S23, 0x676F02D9)
      b = md5GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A)
      a = md5HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942)
      d = md5HH(d, a, b, c, x[k + 8], S32, 0x8771F681)
      c = md5HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122)
      b = md5HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C)
      a = md5HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44)
      d = md5HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9)
      c = md5HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60)
      b = md5HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70)
      a = md5HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6)
      d = md5HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA)
      c = md5HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085)
      b = md5HH(b, c, d, a, x[k + 6], S34, 0x4881D05)
      a = md5HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039)
      d = md5HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5)
      c = md5HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8)
      b = md5HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665)
      a = md5II(a, b, c, d, x[k + 0], S41, 0xF4292244)
      d = md5II(d, a, b, c, x[k + 7], S42, 0x432AFF97)
      c = md5II(c, d, a, b, x[k + 14], S43, 0xAB9423A7)
      b = md5II(b, c, d, a, x[k + 5], S44, 0xFC93A039)
      a = md5II(a, b, c, d, x[k + 12], S41, 0x655B59C3)
      d = md5II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92)
      c = md5II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D)
      b = md5II(b, c, d, a, x[k + 1], S44, 0x85845DD1)
      a = md5II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F)
      d = md5II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0)
      c = md5II(c, d, a, b, x[k + 6], S43, 0xA3014314)
      b = md5II(b, c, d, a, x[k + 13], S44, 0x4E0811A1)
      a = md5II(a, b, c, d, x[k + 4], S41, 0xF7537E82)
      d = md5II(d, a, b, c, x[k + 11], S42, 0xBD3AF235)
      c = md5II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB)
      b = md5II(b, c, d, a, x[k + 9], S44, 0xEB86D391)
      a = md5AddUnsigned(a, AA)
      b = md5AddUnsigned(b, BB)
      c = md5AddUnsigned(c, CC)
      d = md5AddUnsigned(d, DD)
    }
    return (md5WordToHex(a) + md5WordToHex(b) + md5WordToHex(c) + md5WordToHex(d)).toUpperCase()
  }
}
